dt-bindings: arm: samsung: Drop S3C2416

Samsung S3C24xx family of SoCs was removed from the Linux kernel in the
commit 61b7f8920b17 ("ARM: s3c: remove all s3c24xx support"), in January
2023. There are no in-kernel users of remaining S3C24xx compatibles.

Acked-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

Documentation/devicetree/bindings/arm/samsung/samsung-boards.yaml

···
     const: '/'
   compatible:
     oneOf:
-      - description: S3C2416 based boards
-        items:
-          - enum:
-              - samsung,smdk2416                # Samsung SMDK2416
-          - const: samsung,s3c2416
-
       - description: S3C6410 based boards
         items:
           - enum: